JPWO2016170966A1 - Light source device, projection display device, and display system - Google Patents

Abstract

The light source device (10) of the present invention divides a light source (11) that emits light in a first wavelength region and an optical path of light in the first wavelength region that is emitted from the light source into first and second optical paths. And an optical path splitting element (12) that is disposed on the first optical path, is excited by light in the first wavelength band, and emits light in a second wavelength band different from the first wavelength band. One phosphor (131a) is disposed on the second optical path, and is excited by light in the first wavelength range, and emits light in a third wavelength range different from the first and second wavelength ranges. The second phosphor (131 b) to be emitted, the light in the second wavelength range emitted from the first phosphor, and the light in the third wavelength range emitted from the second phosphor are synthesized. And an optical path synthesis element (12).

Description

  The present disclosure relates to a light source device, a projection display device, and a display system used as illumination of a projection display device.

  In recent years, a projector (projection display device) uses a light source device (illumination device) that emits light to a fluorescent material from an individual light source such as a laser and outputs the emitted fluorescence light as illumination light. In addition, a high output can be obtained by forming the phosphor on a reflective material such as a metal so as to have a so-called reflective configuration.

  On the other hand, in the field of user interface (UI), invisible light such as infrared light may be used in addition to visible light in an electronic device incorporating the above projection display device. . Also in the light source device using a fluorescent substance, what has arrange | positioned the near-infrared light source (LED) in addition to the light source for excitation of a fluorescent substance (blue laser) is proposed (for example, patent document 1).

JP 2014-21223 A

  However, in the light source device described in Patent Document 1, the number (type) of light sources is increased, and it is desired to install a cooling mechanism for each of the light sources. For this reason, it is difficult to reduce the size of the entire apparatus.

  Therefore, it is desirable to provide a light source device capable of realizing a simple and compact configuration in a device configuration using a phosphor, and a projection display device and a display system using such a light source device.

  A light source device according to an embodiment of the present disclosure divides a light source that emits light in a first wavelength range and an optical path of light in the first wavelength range that is emitted from the light source into first and second optical paths. An optical path splitting element and a first phosphor that is disposed on the first optical path, is excited by light in the first wavelength band, and emits light in a second wavelength band different from the first wavelength band And a second phosphor that is disposed on the second optical path, is excited by light in the first wavelength band, and emits light in a third wavelength band different from the first and second wavelength bands And an optical path synthesizing element that synthesizes the light in the second wavelength region emitted from the first phosphor and the light in the third wavelength region emitted from the second phosphor. .

  A projection display device according to an embodiment of the present disclosure includes the light source device according to the embodiment of the present disclosure.

  A display system according to an embodiment of the present disclosure includes the projection display device according to the embodiment of the present disclosure.

  In the light source device, the projection display device, and the display system according to the embodiment of the present disclosure, the light in the first wavelength region emitted from the light source is divided into the first and second optical paths in the optical path dividing element. On the first optical path, fluorescence is generated (fluorescent light emission) in the first phosphor using the light in the first wavelength region as the excitation light, whereby the light in the second wavelength region is emitted. On the second optical path, fluorescence is generated in the second phosphor using the light in the first wavelength region as excitation light, and thereby light in the third wavelength region is emitted. The light in the second and third wavelength ranges emitted on each optical path is synthesized by an optical path synthesis element and output.

  According to the light source device, the projection display device, and the display system of the embodiment of the present disclosure, the light in the first wavelength range emitted from the light source is divided into the first and second optical paths by the optical path dividing element, On the first optical path, the first phosphor is used to emit light in the second wavelength range, while on the second optical path, the second phosphor is used to emit light in the third wavelength range. Exit. The lights in the second and third wavelength ranges are synthesized by an optical path synthesis element and output. In this way, light in a plurality of wavelength ranges can be output using a light source in one wavelength range. Compared to the case where a plurality of light sources having different wavelength ranges are arranged, the number (type) of light sources can be reduced, and the cooling mechanism can be reduced. Therefore, a simple and compact configuration can be realized in the device configuration using the phosphor.

  The above content is an example of the present disclosure. The effects of the present disclosure are not limited to those described above, and may be other different effects or may include other effects.

It is a mimetic diagram showing the example of composition of the light source device concerning a 1st embodiment of this indication. It is a characteristic view showing an example of the wavelength range (blue range, green range-red range, and infrared range) in the light source device shown in FIG. It is a characteristic view showing the optical characteristic in the optical path splitting / combining element shown in FIG. It is a schematic diagram showing the structural example of the light source device which concerns on a 1st comparative example. It is a schematic diagram showing the structural example of the light source device which concerns on a 2nd comparative example. It is a characteristic view showing the incident angle dependence of the transmittance | permeability in a dichroic mirror. It is a schematic diagram showing the structural example of the light source device which concerns on 2nd Embodiment of this indication. It is a characteristic view showing the optical characteristic in the optical path splitting / combining element shown in FIG. It is a schematic diagram showing the structural example of the light source device which concerns on a 1st modification. It is a schematic diagram showing the structural example of the light source device which concerns on a 2nd modification. It is a schematic diagram showing the structural example of the light source device which concerns on a 3rd modification. It is a functional block diagram showing the whole structure of the projection type display apparatus which concerns on a 1st application example. It is a schematic diagram showing the structure of the display system which concerns on a 2nd application example. It is a functional block diagram of the display system shown in FIG. It is a schematic diagram showing the structure of the display system which concerns on a 3rd application example.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. First embodiment (an example of a light source device that divides an optical path of light emitted from a light source unit, converts the wavelength for each optical path, and synthesizes and outputs the result)
2. Second embodiment (an example of a light source device that divides an optical path of emitted light from a light source unit using polarized light, converts the wavelength for each optical path, and then combines and outputs the optical path)
3. Modification 1 (Example in which two types of phosphors are held on one rotating body)
4). Modification 2 (example using a transmission type wavelength converter)
5. Modified example 3 (example in which a transmissive wavelength conversion unit is used)
6). Application example 1 (example of a projection display device)
7). Application examples 2 and 3 (example of display system)

[Constitution]
FIG. 1 illustrates a configuration example of a light source device (light source device 10) according to the first embodiment of the present disclosure. The light source device 10 is used as illumination of a projection display device (projector) described later, for example.

  The light source device 10 includes, for example, a light source unit 11A including a light source 11, an optical path dividing / synthesizing element 12, and wavelength conversion units 13A and 13B. Lenses 121 and 122 are arranged in the light source unit 11A. A lens 123 is disposed between the optical path dividing / synthesizing element 12 and the wavelength converting unit 13A, and a lens 124 is disposed between the optical path dividing / synthesizing element 12 and the wavelength converting unit 13B.

  The light source 11 is a light source that emits light in the wavelength region W1 (first wavelength region), and includes, for example, a semiconductor laser (LD) or a light emitting diode (LED). The light source 11 is an excitation light source for each phosphor (phosphors 131a and 131b described later) of the wavelength conversion units 13A and 13B, and emits light in the wavelength region W1, for example, light in the blue region (blue light). . In this specification, the light in the wavelength band W1 indicates light having a light emission intensity peak in the wavelength band W1.

  The optical path splitting / synthesizing element 12 splits the optical path of the light (L1) in the wavelength band W1 emitted from the light source unit 11A by transmitting a part of the light L1 and reflecting the other, and the light after wavelength conversion. It is an element that synthesizes (light L2 in wavelength region W2 and light L3 in wavelength region W3). The optical path splitting / synthesizing element 12 is configured by, for example, a dichroic mirror, and is disposed so that, for example, the incident surface (or reflecting surface) forms 45 degrees with respect to the incident optical path. The optical path splitting / synthesizing element 12 is an element having both the function of the “optical path splitting element” and the function of the “optical path combining element” of the present disclosure. That is, a configuration example in the case where the “optical path dividing element” also serves as the “optical path combining element” is shown. The optical path splitting / synthesizing element 12 is not limited to a dichroic mirror, and may be configured by a dichroic prism.

  In the present embodiment, the optical path splitting / synthesizing element 12 uses the optical path of the incident light L1 as, for example, an optical path (first optical path) along the traveling direction of the light L1 (the negative direction in the X-axis direction in FIG. 1) And an optical path (second optical path) along a direction orthogonal to the traveling direction of the light L1 (positive direction in the Y-axis direction in FIG. 1). In FIG. 1, the light L1 that passes through the optical path splitting / combining element 12 (light traveling in the negative direction of the X-axis) is the light L11, and the light reflected by the optical path splitting / combining element 12 (Y-axis direction). The light traveling in the positive direction) is shown as light L12. The optical path splitting / synthesizing element 12 is configured to synthesize and emit the light L2 in the wavelength region W2 and the light L3 in the wavelength region W3 (along the same direction). The combined light of these lights L2 and L3 becomes the output of the light source device 10.

  FIG. 2 shows an example of the wavelength ranges W1 to W3. Thus, for example, the wavelength region W1 is a blue region, the wavelength region W2 is a wavelength region including a green region and a red region (yellow wavelength region), and the wavelength region W3 is an infrared region (near infrared region). Here, a blue laser is used as the light source 11, and the light L1 has a light emission intensity peak in the wavelength region W1. The wavelength region W1 is, for example, 430 nm to 480 nm, the wavelength region W2 is, for example, 480 nm to 700 nm, and the wavelength region W3 is, for example, 700 nm to 2000 nm.

  An example of a combination of these wavelength ranges W1 to W3 is shown in Table 1 below. Note that Example 1 shown in Table 1 corresponds to a combination of the wavelength ranges W1 to W3 of the present embodiment.

  As in Example 2 shown in Table 1, the wavelength region W1 of the light (excitation light) emitted from the light source 11 is not limited to the blue region, but may be an ultraviolet region (for example, 300 nm to 430 nm). In this case, for example, an ultraviolet laser (UV laser) can be used as the light source 11. Further, as in Examples 3 and 4, the wavelength region W2 may be a green region (for example, 480 nm to 590 nm) and the wavelength region W3 may be a red region (for example, 580 nm to 700 nm). Further, as in Example 5, the wavelength region W1 may be an ultraviolet region, the wavelength region W2 may be a wavelength region including a green region and a red region, and the wavelength region W3 may be a blue region. In addition, as in Example 6, the wavelength region W1 may be a blue region, the wavelength region W2 may be a wavelength region including a green region and a red region, and the wavelength region W3 may be a red region.

  Thus, the combination of the wavelength ranges W1 to W3 is not particularly limited, and various combinations can be taken according to the application. For example, in a special display (for example, a display for a night vision device) or an application other than the display (for example, sensing), the wavelength region W3 can be set to the infrared region (Examples 1 and 2). ). Or in the use which raises the color purity of illumination light, or supplements color, each of the wavelength ranges W2 and W3 may be a combination of visible wavelength ranges (Examples 3 to 6).

  FIG. 3 shows an example of the optical characteristics (transmittance in the wavelength regions W1 to W3) of the optical path dividing / synthesizing element 12. The optical path splitting / synthesizing element 12 is designed so that the transmittance (reflectance) differs for each wavelength region with respect to the above-described wavelength regions W1 to W3. For example, the transmittance is a% (reflectance is (100-a)%) in the wavelength region W1, the transmittance is approximately 0% (the reflectance is approximately 100%) in the wavelength region W2, and the transmittance is in the wavelength region W3. It is designed to be approximately 100% (reflectance is approximately 0%). By adjusting the transmittance a of the wavelength region W1, the ratio of the transmission amount and the reflection amount in the optical path splitting / combining element 12 (the split ratio of the light L1 to the lights L11 and L12 (distribution ratio)) according to the application. That is, the intensity ratio between the light beams L2 and L3 in the wavelength regions W2 and W3 can be freely set. Depending on the layout of the optical system, the transmittance in the wavelength region W2 is approximately 100%, and the transmittance in the wavelength region W3 is approximately 0%. That is, it is sufficient that one of the wavelength ranges W2 and W3 is transmitted and the other is reflected.

  The wavelength conversion units 13A and 13B are elements having a function of converting the wavelength range W1 of incident light into the wavelength range W2 or the wavelength range W3. In the present embodiment, both of these wavelength converters 13A and 13B are so-called reflection types, and are configured to reflect and emit fluorescence generated by incidence of excitation light.

  The wavelength conversion unit 13A includes a phosphor 131a that generates fluorescence in the wavelength region W2 using the light L11 in the wavelength region W1 as excitation light. The phosphor 131a is disposed so that at least a part of the phosphor 131a is opposed to the optical path (first optical path) of the light L11 in a state where the phosphor 131a is held by, for example, a disk-shaped rotating body 132 (wheel). As the phosphor 131a, for example, a powder, glass, or crystal can be used. The rotating body 132 is connected to a motor 133 (driving unit), and can be rotated around an axis A1 by a driving force of the motor 133. In the rotating body 132, the phosphor 131a is held on the reflecting member (reflecting surface). The phosphor 131a is formed on the rotating body 132 so as to form, for example, an annular shape, a circular arc shape, or a circular shape around the axis A1. In such a configuration, the rotating body 132 is driven by the motor 133 and rotates, so that the light L11 is incident on a part of the phosphor 131a. The wavelength conversion unit 13A may be provided with a cooling mechanism (not shown).

  The wavelength conversion unit 13B includes a phosphor 131b that generates fluorescence in the wavelength region W3 using the light L12 in the wavelength region W1 as excitation light. For example, the phosphor 131b is disposed on the optical path (second optical path) of the light L12 so that at least a part thereof is opposed to the phosphor 131b while being held by the rotating body 132. As the phosphor 131b, for example, a powder, glass, or crystal can be used. The rotating body 132 is rotatable around the axis A2 by the driving force of the motor 133. In the rotating body 132, the phosphor 131b is held on the reflecting member. The phosphor 131b is formed on the rotating body 132 so as to form, for example, an annular shape, an arc shape, or a circle shape about the axis A2. In such a configuration, the rotating body 132 is driven and rotated by the motor 133, so that the light L12 is incident on a part of the phosphor 131b cyclically. Note that a cooling mechanism (not shown) may be installed in the wavelength conversion unit 13B.

  Here, in the wavelength conversion units 13A and 13B, the phosphors 131a and 131b are held by the rotator 132, but the rotator 132 may not be provided depending on the excitation energy of the phosphors 131a and 131b. (The phosphors 131a and 131b do not need to rotate). Any structure may be used as long as the phosphors 131a and 131b are arranged on the optical paths of the lights L11 and L12, respectively.

  The lenses 121 and 122 are a lens group for condensing the light L1 emitted from the light source 11 and causing the light L1 to enter the optical path dividing / combining element 12. Here, in the light source unit 11A, the two lenses 121 and 122 are illustrated, but one lens may be used, or three or more lenses may be used. The lenses 121 and 122 guide the lights L2 and L3 emitted from the phosphors 131a and 131b to the optical path dividing / synthesizing element 12, respectively.

  The lens 123 condenses the light (light L11) emitted from the optical path dividing / synthesizing element 12 and causes the light to enter the phosphor 131a, and also splits the light emitted from the phosphor 131a (light L2 after wavelength conversion). / It leads to the synthesis element 12. The lens 124 condenses the light (light L12) emitted from the optical path splitting / synthesizing element 12 and makes it incident on the phosphor 131b, and the light emitted from the phosphor 131b (light L3 after wavelength conversion) It leads to the dividing / synthesizing element 12.

[Action, effect]
In the light source device 10 of the present embodiment, when the light source 11 is driven and the light L1 in the wavelength region W1 is emitted from the light source unit 11A, the light L1 enters the optical path dividing / synthesizing element 12. Since the optical path splitting / synthesizing element 12 has the optical characteristics shown in FIG. 3, a part (light L11) of the light L1 in the wavelength band W1 is transmitted and the other part (light L12) is reflected. Is done. Thereby, the optical path of the light L1 in the wavelength band W1 is divided into the light L11 and the light L12.

  The light L11 that has passed through the optical path dividing / synthesizing element 12 is collected by the lens 123 onto the phosphor 131a of the wavelength conversion unit 13A. Thereby, the phosphor 131a is excited, for example, by the light L11 in the blue region, and generates fluorescence of the light L2 in the wavelength region W2 including the green region and the red region, for example. The wavelength-converted light L2 is reflected on the rotating body 132 and then enters the lens 123 again. The lens 123 converts the light into parallel light and enters the optical path dividing / synthesizing element 12.

  On the other hand, the light L12 reflected by the optical path splitting / synthesizing element 12 is collected by the lens 124 onto the phosphor 131b of the wavelength conversion unit 13B. Thereby, the phosphor 131b is excited by the light L12 in the wavelength region W1 (for example, the blue region), and generates fluorescence of the light L3 in the wavelength region W3 (for example, the infrared region). The wavelength-converted light L3 is reflected on the rotator 132 and then enters the lens 124 again. The light is converted into parallel light by the lens 124 and enters the optical path dividing / synthesizing element 12.

  Since the optical path splitting / synthesizing element 12 has the optical characteristics as shown in FIG. 3, the light L2 out of the incident light L2 in the wavelength band W2 and light L3 in the wavelength band W3 is the optical path splitting / synthesizing element 12. The light L3 is transmitted through the optical path splitting / combining element 12. Thereby, the optical paths of the lights L2 and L3 are synthesized (color synthesis). The combined light of the lights L2 and L3 becomes the output of the light source device 10.

  Here, FIG. 4 shows an example of a light source device using a phosphor as a comparative example (comparative example 1) of the present embodiment. The light source device of Comparative Example 1 includes a light source 101 that emits light in the wavelength region W1 (light L101), a dichroic mirror 102, a lens 103, and a wavelength conversion unit 104. The dichroic mirror 102 is designed to reflect the wavelength region W2 while transmitting the wavelength region W1, for example. The wavelength conversion unit 104 includes a phosphor 1041, a rotating body 1042, and a motor 1043. In Comparative Example 1, the light L101 emitted from the light source 101 is transmitted through the dichroic mirror 102 and then condensed on the phosphor 1041 by the lens 103. When the phosphor 1041 is excited by the light L101, fluorescence of the light L102 in the wavelength region W2 is generated and reflected toward the lens 103. The light L102 enters the dichroic mirror 102 via the lens 103. The light L102 in the wavelength band W2 is reflected by the dichroic mirror 102.

  FIG. 5 shows another example of a light source device using a phosphor as a comparative example (comparative example 2) of the present embodiment. Similar to Comparative Example 1, the light source device of Comparative Example 2 includes a light source 101, a dichroic mirror 102, a lens 103, and a wavelength conversion unit 104. However, Comparative Example 2 further includes a light source 105 that emits light in the wavelength region W3 (for example, infrared light). A lens 106 is disposed between the light source 105 and the dichroic mirror 102. The dichroic mirror 102 is designed to reflect the wavelength region W2 while transmitting the wavelength regions W1 and W3, for example. With this configuration, in Comparative Example 2, as in Comparative Example 1, the light L101 emitted from the light source 101 passes through the dichroic mirror 102 and is then collected on the phosphor 1041. Thereby, the phosphor 1041 is excited by the light L101, and fluorescence of the light L102 in the wavelength region W2 is generated. The light L102 enters the dichroic mirror 102 again via the lens 103, and is reflected by the dichroic mirror 102. On the other hand, the light L 103 in the wavelength region W 3 emitted from the light source 105 enters the dichroic mirror 102 through the lens 106 and passes through the dichroic mirror 102. In this way, the light L102 in the wavelength region W2 and the light L103 in the wavelength region W3 are combined and emitted from the light source device 10.

  In these comparative examples 1 and 2, it is ideal that the dichroic mirror 102 transmits 100% of the light L101 in the wavelength region W1. However, in reality, it is difficult to maintain 100% transmission (or reflection) characteristics because the transmission characteristics of the dichroic mirror 102 are incident angle dependent and there are design limitations in the manufacturing process. is there. For example, as shown in FIG. 6, in the dichroic mirror 102, the transmittance with respect to the wavelength changes according to the incident angle. When incident from an angle direction of 45 degrees with respect to the incident surface (reflection surface) of the dichroic mirror 102, and when incident from a direction deviated by + (plus) 12 degrees or − (minus) 12 degrees from the 45 degree angle direction It can be seen that each has different transmission characteristics. In this way, actually, light (leakage light X1) that is reflected without being transmitted is also present in the light L101 in the wavelength band W1 incident on the dichroic mirror 102. For this reason, the utilization efficiency of light will fall.

  In Comparative Example 2, the leaked light X1 is incident on the light source 105 such as an LED, causing damage to the light source 105 and deterioration. Moreover, it leads to the temperature rise of the light source 105, and it becomes a factor which luminous efficiency falls. In addition, when outputting light in a plurality of wavelength regions including the infrared region as in Comparative Example 2, if two or more types of light sources 101 and 105 are used, the number (types) of light sources increases, and those It is desirable to install a cooling mechanism for each light source. For this reason, it is difficult to reduce the size of the entire apparatus.

  On the other hand, in the present embodiment, the optical path of the light L1 in the wavelength region W1 emitted from the light source 11 (light source unit 11A) is split by the optical path splitting / combining element 12. On the divided one optical path (first optical path), fluorescence is generated in the phosphor 131a using the light L1 in the wavelength region W1 as excitation light (fluorescence emission), and thereby the light L2 in the wavelength region W2 is emitted. . On the other optical path (second optical path), fluorescence is generated in the phosphor 131b using the light L1 in the wavelength region W1 as excitation light, and thereby the light L3 in the wavelength region W3 is emitted. The light L2 in the wavelength range W2 and the light L3 in the wavelength range W3 emitted on each optical path are combined by the optical path dividing / synthesizing element 12 and output to the outside of the light source device 10. That is, using the light source 11 that emits light L1 in one wavelength region (wavelength region W1), light in a plurality of wavelength regions (wavelength regions W2, W3) can be synthesized and extracted.

  As described above, in the present embodiment, light in a plurality of wavelength ranges (wavelength ranges W2 and W3) can be extracted using the light source 11 that emits the light L1 in one wavelength range W1. Compared to the case where (a plurality of types) of light sources having a plurality of different wavelength ranges are arranged (Comparative Example 2), the number of light sources can be reduced, and thereby the cooling mechanism can be reduced. Therefore, a simple and compact configuration can be realized in the device configuration using the phosphor.

  Further, by adjusting the ratio of the transmittance (reflectance) in the optical path dividing / synthesizing element 12, not only the transmitted light but also the reflected light can be used effectively. Light loss due to leaked light X1 as in Comparative Examples 1 and 2 can be suppressed, and a decrease in light utilization efficiency can be suppressed. In addition, the number (type) of light sources can be reduced, leading to cost reduction.

  Furthermore, since the distribution ratio to the wavelength ranges W2 and W3 can be adjusted by controlling the transmittance of the wavelength range W1 in the optical path splitting / synthesizing element 12, various combinations of the wavelength ranges W1 to W3 can be selected depending on the application. You can choose. For example, a light beam having a color balance that matches the display image can be output as illumination light. At this time, an appropriate color balance can be set by controlling the transmittance of the optical path dividing / synthesizing element 12. Therefore, for example, output adjustment by gradation is not necessary in the display device. For this reason, a useless light beam becomes difficult to enter a display device, the temperature rise of a display device (panel) is suppressed, and it leads to reliability improvement. Further, in night vision applications, the present invention can also be applied to cases where the proportion of infrared light is higher than that of visible light.

  Next, embodiments and modifications different from the first embodiment will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

<Second Embodiment>
[Constitution]
FIG. 7 illustrates a configuration example of a light source device (light source device 20) according to the second embodiment of the present disclosure. The light source device 20 is used, for example, as illumination of a projection type display device described later, similarly to the light source device 10 of the first embodiment. The light source device 20 includes, for example, a light source unit 11A including a light source 11, a phase difference plate 14 (polarization rotating element), an optical path splitting / synthesizing element 15, wavelength converters 13A and 13B, and lenses 123 and 124. I have.

  As in the first embodiment, the light source unit 11A includes a light source 11 (not shown in FIG. 7) that emits light in the wavelength region W1 (first wavelength region), lenses 121, 122, and the like. It is configured to include. However, in the present embodiment, a light source having linear polarization characteristics (emits linearly polarized light) such as a semiconductor laser is used as the light source 11. In this light source unit 11A, the light source 11 may be arranged in a state of being rotated around the optical axis. In this case, the polarization direction of the light L1 is rotated without arranging the later-described retardation plate 14. Can be emitted.

  The phase difference plate 14 changes (rotates) the polarization direction of the light (linearly polarized light) L1 emitted from the light source unit 11A, and is composed of, for example, a ½ wavelength plate. The phase difference plate 14 is disposed with its optical axis (slow axis or fast axis) inclined at a predetermined angle with respect to the polarization direction of the light L1 in the YZ plane. Specifically, the phase difference plate 14 is arranged so that the polarization direction of the light L1 incident on the optical path splitting / synthesizing element 15 is inclined by a predetermined angle (for example, 45 degrees) with respect to the Z axis. The phase difference plate 14 can adjust the tilt angle of the polarization direction of the light L1, and can arbitrarily set the ratio (division ratio) between the transmission amount of the s-polarized component and the reflection amount of the p-polarized component in the optical path splitting / combining element 15. can do. Further, a drive mechanism that rotates the retardation plate 14 around the optical axis may be provided, and thereby the direction of the polarization direction of the light L1 may be controlled automatically or manually. Added a function to change the split ratio of the p-polarized component and the s-polarized component in the optical path splitting / synthesizing element 15 manually or automatically (for example, depending on the image to be displayed (projected)). You can also

  Similarly to the optical path splitting / synthesizing element 12 of the first embodiment, the optical path splitting / synthesizing element 15 splits the optical path of the light L1 in the wavelength region W1 emitted from the light source unit 11A and also outputs the light after wavelength conversion ( It is an element that synthesizes light L2 in the wavelength region W2 and light L3) in the wavelength region W3. Further, the optical path splitting / synthesizing element 15 is configured by, for example, a dichroic mirror, and is disposed such that, for example, the incident surface (or reflecting surface) forms 45 degrees with respect to the X-axis direction. The optical path splitting / synthesizing element 15 is not limited to a dichroic mirror, and may be configured by a dichroic prism or a polarization beam splitter (PBS).

  However, in the present embodiment, the optical path splitting / synthesizing element 15 is configured to have different transmission characteristics (or reflection characteristics) according to the polarization component. In FIG. 7, the first polarization component (for example, p-polarization component) that passes through the optical path splitting / combining element 15 in the light L1 is set as the light L11p, and the second polarized light component reflected by the optical path splitting / combining element 15 ( For example, s-polarized component) is shown as light L12s. The optical path splitting / synthesizing element 15 is configured to synthesize light (L2p) in the wavelength region W2 and light (L3s) in the wavelength region W3 (together along the same direction). The combined light of these lights L2p and L3s becomes the output of the light source device 20.

  FIG. 8 shows an example of the optical characteristics of the optical path splitting / synthesizing element 15 (transmittance between the s-polarized component and the p-polarized component in the wavelength regions W1 to W3). The optical path splitting / synthesizing element 15 is designed so that the transmittance (reflectance) differs between the p-polarized component (solid line) and the s-polarized component (broken line) in the wavelength ranges W1 to W3. For example, in the band corresponding to at least the light L1 in the wavelength band W1, the transmittance of the p-polarized component is approximately 100% (reflectance is approximately 0%), whereas the transmittance of the s-polarized component is approximately 0% ( The reflectance is approximately 100%). The ratio between the transmission amount of the s-polarized component and the reflection amount of the p-polarized component is arbitrarily set by adjusting the tilt angle of the polarization direction of the light L1 incident on the optical path splitting / synthesizing element 15 having such characteristics. be able to. For example, when the polarization direction of the incident light L1 is inclined by 45 degrees with respect to the Z axis, for example, the transmission amount of the p-polarized component and the reflection amount of the s-polarized component of the light L1 are halved (approximately 50%). Each).

  On the other hand, in the wavelength region W2, the transmittance of both the p-polarized component and the s-polarized component is approximately 0% (the reflectance is approximately 100%), and in the wavelength region W3, both the p-polarized component and the s-polarized component are transmitted. The rate is about 100% (reflectance is about 0%). Thus, in the optical path splitting / synthesizing element 15, the light L1 in the wavelength band W1 can be split in the optical path by setting the transmittance in the wavelength band W1 to be different for each polarization component.

[Action, effect]
In the light source device 20 of the present embodiment, the light (linearly polarized light) L1 in the wavelength region W1 emitted from the light source unit 11A enters the phase difference plate 14, and the polarization direction of the phase difference plate 14 is inclined at a predetermined angle. The light is rotated so as to be emitted. When the light L1 emitted from the phase difference plate 14 enters the optical path splitting / synthesizing element 15, the p-polarized component (light L11p) of the light L1 passes through the optical path splitting / synthesizing element 15, and the s-polarized component (light L12s) is the optical path. Reflected by the dividing / combining element 15. In this way, the optical path of the light L1 is divided.

  When the light (p-polarized light) L11p transmitted through the optical path splitting / synthesizing element 15 is condensed on the phosphor 131a of the wavelength conversion unit 13A by the lens 123, light in the wavelength region W2 (p-polarized light) is emitted by fluorescence. L2p is generated. The light L2p after the wavelength conversion is reflected on the rotating body 132 and then enters the optical path dividing / synthesizing element 15 through the lens 123.

  On the other hand, when the light (s-polarized light) L12s reflected by the optical path splitting / synthesizing element 15 is condensed on the phosphor 131b of the wavelength conversion unit 13B by the lens 124, light in the wavelength region W3 (by fluorescence emission) s-polarized light) L3s. The wavelength-converted light L3s is reflected on the rotator 132 and then enters the optical path splitting / synthesizing element 15 via the lens 124.

  When the lights L2p and L3s enter the optical path splitting / synthesizing element 15 in this way, the light (p-polarized light) L2p in the wavelength region W2 is reflected by the optical path splitting / synthesizing element 15 due to the optical characteristics shown in FIG. The On the other hand, light (s-polarized light) L3s in the wavelength region W3 is transmitted through the optical path splitting / synthesizing element 15. Thereby, the optical paths of the lights L2p and L3s are synthesized (color synthesis). The combined light of the lights L2p and L3s becomes the output of the light source device 20.

  As described above, also in the light source device 20 according to the present embodiment, the light source 11 (light source unit 11A) that emits the light L1 in one wavelength region (wavelength region W1) is used to form a plurality of wavelength regions (wavelength regions W2). , W3) can be synthesized and extracted. Therefore, an effect equivalent to that of the first embodiment can be obtained.

<Modification 1>
FIG. 9 illustrates a configuration example of a light source device (light source device 10A) according to Modification 1. The light source device 10A includes, for example, a light source unit 11A, an optical path dividing / synthesizing element 12, a wavelength conversion unit 13C, lenses 123 and 124, and an optical path conversion element 125. In this modification, in the wavelength conversion unit 13C, the phosphor 131a that performs the conversion from the wavelength region W1 to the wavelength region W2 and the phosphor 131b that performs the conversion from the wavelength region W1 to the wavelength region W3 rotate in the same manner. It is held by the body (rotary body 134).

  The wavelength conversion unit 13C is an element having a function of converting the wavelength range W1 of the incident light into the wavelength ranges W2 and W3, similarly to the wavelength conversion units 13A and 13B of the first embodiment. However, in the wavelength conversion unit 13C of the present modification, both the phosphors 131a and 131b are held on the rotating body 134 (wheel) via the reflecting surface.

  The phosphors 131a and 131b are each formed in an annular shape around the axis A3 on the rotating body 134, for example, and are concentric with each other. The phosphor 131a is disposed on the optical path (first optical path) of the light L11 so that at least a part thereof is opposed to the phosphor 131a while being held by the rotating body 134. The phosphor 131b is disposed on the optical path (second optical path) of the light L12 so that at least a part thereof is opposed to the phosphor 131b while being held by the rotating body 134. The rotating body 134 is connected to a motor 135 (driving unit), and can be rotated around the axis A3 by the driving force of the motor 135. In such a configuration, when the rotating body 134 is driven and rotated by the motor 135, the light L11 is cyclically incident on a part of the phosphor 131a, while the light L12 is cyclically incident on a part of the phosphor 131b. Incident. Note that a cooling mechanism (not shown) may be installed in the wavelength conversion unit 13C.

  The optical path conversion element 125 is composed of, for example, a mirror, converts the optical path of the light L12 reflected (divided) by the optical path splitting / combining element 12, and enters the phosphor 131b of the wavelength conversion unit 13C.

  Also in this modified example, as in the first embodiment, the light L1 in the wavelength band W1 emitted from the light source unit 11A is partially transmitted (light L11) in the optical path dividing / combining element 12, The other part (light L12) is reflected to divide the optical path. When the light L11 transmitted through the optical path dividing / synthesizing element 12 is condensed on the phosphor 131a of the wavelength conversion unit 13C by the lens 123, the light L2 in the wavelength region W2 is generated by fluorescence emission. The light L2 after the wavelength conversion is reflected on the rotating body 134 and then enters the optical path dividing / synthesizing element 12 through the lens 123. On the other hand, when the light L12 reflected by the optical path splitting / synthesizing element 12 is optically path-converted by the optical path conversion element 125 and then condensed by the lens 124 onto the phosphor 131b of the wavelength conversion unit 13C, fluorescence is emitted. The light L3 in the wavelength band W3 is generated. The light L3 after wavelength conversion is reflected on the rotating body 134 and then enters the optical path splitting / combining element 12 via the lens 124 and the optical path conversion element 125. Similar to the first embodiment, the light L2 in the wavelength band W2 is reflected by the optical path splitting / combining element 12, and the light L3 in the wavelength band W3 is transmitted through the optical path splitting / synthesizing element 12. Thereby, the optical paths of the lights L2 and L3 are synthesized (color synthesis). The combined light of the lights L2 and L3 becomes the output of the light source device 10A.

  Thus, also in this modification, the light source 11 (light source unit 11A) that emits the light L1 in one wavelength region (wavelength region W1) is used to emit light in a plurality of wavelength regions (wavelength regions W2, W3). Can be synthesized and taken out. Therefore, an effect equivalent to that of the first embodiment can be obtained.

<Modification 2>
FIG. 10 illustrates a configuration example of a light source device (light source device 10B) according to Modification 2. The light source device 10B includes, for example, a light source unit 11A, an optical path splitting element 16A, wavelength conversion units 17A and 17B, lenses 123 and 124, optical path conversion elements 126a and 126b, and an optical path combining element 16B. In the present modification, unlike the first embodiment, the wavelength conversion units 17A and 17B are so-called transmission types, and are configured to transmit and emit fluorescence generated by the incidence of excitation light. is there. In the first embodiment, the optical path splitting / synthesizing element 12 has both the optical path splitting function and the optical path combining function. However, in this modification, the optical path splitting element 16A and the optical path combining element 16B are respectively provided. It is arrange | positioned in a different position as a separate member.

  The optical path splitting element 16A is an element that splits the optical path of the light L1 in the wavelength region W1 emitted from the light source unit 11A. Similar to the optical path splitting / combining element 12 of the first embodiment, the optical path splitting element 16A is configured to transmit a part of the light L1 in the wavelength band W1 and reflect the other part. . The optical path splitting element 16A is configured by, for example, a dichroic mirror, and is disposed, for example, such that the incident surface (or reflecting surface) forms 45 degrees with respect to the X-axis direction. The optical path splitting / synthesizing element 15 is not limited to a dichroic mirror, and may be composed of a dichroic prism. In FIG. 10, the light L1 that passes through the optical path splitting element 16A (light traveling in the negative direction of the Y-axis) is the light L11, and the light reflected by the optical path splitting element 16A (in the negative direction of the X-axis direction). Advancing light) is shown as light L12.

  The wavelength conversion unit 17A is an element having a function of converting the wavelength range W1 of the incident light into the wavelength range W2, similarly to the wavelength conversion unit 13A of the first embodiment. The wavelength converter 17A is configured such that the phosphor 171a is held on the rotating body 172, and the fluorescence generated in the phosphor 171a passes through the rotating body 172. The phosphor 171a is formed to have an annular shape, an arc shape, a circular shape, or the like around the axis A4, similarly to the phosphor 131a of the first embodiment. In addition, the phosphor 171a is disposed so that at least a part thereof is opposed to the optical path (first optical path) of the light L11 in a state where the phosphor 171a is held by the rotating body 172. As the phosphor 171a, for example, a powder, glass, or crystal can be used. The rotating body 172 is connected to a motor 173 (driving unit), and can be rotated around an axis A4 by the driving force of the motor 173. In such a configuration, the rotating body 172 is driven and rotated by the motor 173, so that the light L11 is incident on a part of the phosphor 171a cyclically. Note that a cooling mechanism (not shown) may be installed in the wavelength conversion unit 17A.

  The wavelength conversion unit 17B is an element having a function of converting the wavelength range W1 of incident light into the wavelength range W3, similarly to the wavelength conversion unit 13B of the first embodiment. The wavelength conversion unit 17B is configured such that the phosphor 171b is held on the rotating body 172, and the fluorescence generated in the phosphor 171b passes through the rotating body 172. The phosphor 171b is formed to have an annular shape, a circular arc shape, a circular shape, or the like around the axis A5, similarly to the phosphor 131b of the first embodiment. Further, the phosphor 171b is disposed so that at least a part thereof is opposed to the optical path (second optical path) of the light L12 while being held by the rotating body 172. As the phosphor 171b, for example, a powder, glass, or crystal can be used. The rotating body 172 is rotatable around the axis A5 by the driving force of the motor 173. In such a configuration, the rotating body 172 is driven and rotated by the motor 173, so that the light L12 is incident on a part of the phosphor 171b cyclically. Note that a cooling mechanism (not shown) may be installed in the wavelength conversion unit 17B.

  The optical path conversion elements 126a and 126b are configured by mirrors, for example. The optical path conversion element 126a converts the optical path of the light L2 that has passed through the wavelength conversion unit 17A (after wavelength conversion) and makes it incident on the optical path synthesis element 16B. The optical path conversion element 126b converts the optical path of the light L3 that has passed through the wavelength conversion unit 17B (after wavelength conversion) and makes it incident on the optical path synthesis element 16B.

  The optical path synthesizing element 16B synthesizes (color synthesizes) the optical paths of the light beams L2 and L3 in the wavelength regions W2 and W3 that have been optical path converted by the optical path conversion elements 126a and 126b. The optical path combining element 16B is constituted by, for example, a dichroic mirror. The optical path combining element 16B may be constituted by a dichroic prism.

  Also in the present modification, as in the first embodiment, a part of the light L1 in the wavelength region W1 emitted from the light source unit 11A is transmitted through the optical path splitting element 16A (the light L11), The optical path is divided by reflecting the portion (light L12). When the light L11 that has passed through the optical path splitting element 16A is condensed on the phosphor 171a of the wavelength conversion unit 17A by the lens 123, the light L2 in the wavelength region W2 is generated by fluorescence emission. The wavelength-converted light L2 passes through the rotator 172, undergoes optical path conversion by the optical path conversion element 126a, and then enters the optical path synthesis element 16B. On the other hand, when the light L12 reflected by the optical path splitting element 16A is condensed on the phosphor 171b of the wavelength conversion unit 17B by the lens 124, the light L3 in the wavelength region W3 is generated by fluorescence emission. The wavelength-converted light L3 passes through the rotator 172, undergoes optical path conversion by the optical path conversion element 126b, and then enters the optical path synthesis element 16B. The light L2 in the wavelength band W2 is transmitted through the optical path synthesis element 16B, and the light L3 in the wavelength band W3 is reflected by the optical path synthesis element 16B. Thereby, the optical paths of the lights L2 and L3 are synthesized (color synthesis). The combined light of the lights L2 and L3 becomes the output of the light source device 10B.

  As in this modification, the optical path splitting element 16A and the optical path combining element 16B may be separate members, and the wavelength conversion units 17A and 17B may be of a transmission type. Even in such a configuration, the light source 11 (light source unit 11A) that emits the light L1 in one wavelength range (wavelength range W1) is used to synthesize light in a plurality of wavelength ranges (wavelength ranges W2 and W3). It can be taken out. Therefore, an effect equivalent to that of the first embodiment can be obtained.

<Modification 3>
FIG. 11 illustrates a configuration example of a light source device (light source device 10C) according to Modification 3. The light source device 10C includes, for example, a light source unit 11A, a wavelength conversion unit 17A, a lens 123, a light source 11B, and an optical path synthesis element 18. The light source 11B is a light source that emits light L3 in the wavelength region W3, for example, and is configured by, for example, an LED or a semiconductor laser. The optical path synthesis element 18 synthesizes (colors synthesizes) the optical paths of the light beams L2 and L3 in the wavelength ranges W2 and W3, and is constituted by a dichroic mirror, for example.

  In this modification, the light L1 in the wavelength region W1 emitted from the light source unit 11A is condensed on the phosphor 171a of the wavelength conversion unit 17A by the lens 123, thereby generating the light L2 in the wavelength region W2. The wavelength-converted light L2 passes through the rotator 172 and enters the optical path combining element 18 along the Y-axis direction in FIG. On the other hand, the light L3 in the wavelength region W3 emitted from the light source 11B enters the optical path combining element 18 along the X-axis direction in FIG. The light L2 in the wavelength band W2 is reflected by the optical path synthesis element 18, and the light L3 in the wavelength band W3 passes through the optical path synthesis element 18. Thereby, the optical paths of the lights L2 and L3 are synthesized (color synthesis). The combined light of the lights L2 and L3 becomes the output of the light source device 10C.

  It is good also as a structure using the transmissive | pervious wavelength conversion part 17A and the light source 11B like this modification.

  Next, application examples of the light source device according to the above-described embodiment will be described. In the following description, the light source device 10 of the first embodiment is used for illustration and description, but the present invention is applicable to any of the light source devices of the second embodiment and the first to third modifications. be able to.

<Application example 1>
FIG. 12 is a functional block diagram illustrating the overall configuration of the projection display device (projection display device 1) according to Application Example 1. The projection display device 1 is a display device that projects an image on a screen 110 (projection surface), for example. The projection display device 1 is connected to an external image supply device such as a computer (not shown) such as a PC or various image players via an I / F (interface), and an image signal input to the interface. Based on the above, projection onto the screen 110 is performed.

  The projection display device 1 includes, for example, a light source driving unit 31, a light source device 10, a light modulation device 32, a projection optical system 33, an image processing unit 34, a frame memory 35, a panel driving unit 36, and a projection. An optical system driving unit 37 and a control unit 30 are provided.

  The light source drive unit 31 outputs a pulse signal for controlling the light emission timing of the light source 11 disposed in the light source device 10. The light source drive unit 31 includes, for example, a PWM setting unit, a PWM signal generation unit, a limiter, and the like (not shown), controls the light source driver of the light source device 10 based on the control of the control unit 30, and controls the light source 11 by PWM control. By doing so, the light source 11 is turned on and off, or the luminance is adjusted.

  The light source device 10 is not particularly illustrated, but in addition to the components described in the first embodiment, for example, a light source driver that drives the light source 11 and a current that sets a current value for driving the light source 11 A value setting unit. The light source driver generates a pulse current having a current value set by the current value setting unit in synchronization with a pulse signal input from the light source driving unit 31 based on power supplied from a power supply circuit (not shown). The generated pulse current is supplied to the light source 11.

The light modulation device 32 generates image light by modulating light (illumination light) output from the light source device 10 based on the image signal. The light modulation device 32 includes, for example, three transmissive or reflective light valves corresponding to RGB colors. Examples thereof include a liquid crystal panel that modulates blue light (B), a liquid crystal panel that modulates red light (R), and a liquid crystal panel that modulates green light (G). As the reflective liquid crystal panel, for example, LCOS (Liquid
A liquid crystal element such as “Crystal On Silicon” can be used. However, the light modulation device 32 is not limited to a liquid crystal element, and other light modulation elements such as a DMD (Digital Micromirror Device) may be used. The RGB color lights modulated by the light modulation device 32 are combined by a cross dichroic prism (not shown) or the like and guided to the projection optical system 33.

  The projection optical system 33 includes a lens group for projecting the light modulated by the light modulation device 32 onto the screen 110 to form an image.

  The image processing unit 34 acquires an image signal input from the outside, and performs image size determination, resolution determination, determination of whether the image is a still image or a moving image, and the like. In the case of a moving image, the image data attributes such as the frame rate are also determined. If the resolution of the acquired image signal is different from the display resolution of each liquid crystal panel of the light modulation device 32, resolution conversion processing is performed. The image processing unit 34 develops the image after each processing in the frame memory 35 for each frame, and outputs the image for each frame developed in the frame memory 35 to the panel driving unit 36 as a display signal.

  The panel drive unit 36 drives each liquid crystal panel of the light modulation device 32. By driving the panel drive unit 36, the light transmittance of each pixel arranged in each liquid crystal panel changes, and an image is formed.

  The projection optical system drive unit 37 includes a motor that drives a lens arranged in the projection optical system 33. The projection optical system drive unit 37 drives, for example, the projection optical system 33 according to the control of the control unit 30, and performs, for example, zoom adjustment, focus adjustment, aperture adjustment, and the like.

  The control unit 30 controls the light source driving unit 31, the image processing unit 34, the panel driving unit 36, and the projection optical system driving unit 37.

  In the projection display device 1, by providing the light source device 10 described above, simplification and compactness of the entire device can be realized.

<Application example 2>
FIG. 13 schematically illustrates the configuration of a display system according to Application Example 2. FIG. 14 illustrates a functional configuration of a display system according to Application Example 2. This display system includes a wristband type terminal (wristband type information processing device) 2 and a smartphone (external device) 3.

  The smartphone 3 is, for example, an information processing device that operates in cooperation with the wristband type terminal 2, and transmits an image for projection or display to the wristband type terminal 2 and receives information indicating a user operation. It has a function to do. Specifically, the smartphone 3 transmits an image indicating a graphical user interface (GUI) to the wristband type terminal 2 and receives a user operation signal for the GUI. And the smart phone 3 performs the process according to the received user operation, and transmits the image which shows GUI updated according to the process to the wristband type | mold terminal 2. FIG.

  The external device that operates in cooperation with the wristband type terminal 2 is not limited to a smartphone, but other information processing devices such as a digital still camera, a digital video camera, a PDA (Personal Digital Assistants), and a PC (Personal Computer). ), A notebook PC, a tablet terminal, a mobile phone terminal, a portable music playback device, a portable video processing device, or a portable game device.

  The wristband type terminal 2 includes, for example, the display unit 210 and the projection type display device 1 including the light source device (for example, the light source device 10) according to the above-described embodiment. It is used by being mounted on the like. The band portion 2a is made of, for example, leather, metal, fiber, rubber, or the like, similarly to the wristwatch band.

  The wristband type terminal 2 further includes a control unit 220, a communication unit 230, an imaging unit 240, an operation unit 250, and a sensor unit 260, for example, as shown in FIG. In addition, the wristband type terminal 2 is connected to the smartphone 3 by wireless communication, and operates in cooperation with the smartphone 3. For example, an image received from the smartphone 3 in a user's clothes pocket or the like can be displayed on the display unit 210 or projected onto the user's palm or the like using the projection display device 1.

  The display unit 210 displays an image (a still image or a moving image) based on control by the control unit 220 and includes, for example, an LCD (Liquid Crystal Display) or an OLED (Organic Light-Emitting Diode). Has been. The display unit 210 is configured integrally with the operation unit 250, for example, and functions as a so-called touch panel.

  The communication unit 230 transmits and receives signals (image signals, user operation signals, and the like) to and from the smartphone 3. As a communication method, for example, wireless, Bluetooth (registered trademark), WiHD (Wireless High Definition), WLAN (Wireless Local Area Network), Wi-Fi (Wireless Fidelity: registered trademark), NFC (Near Field communication), infrared communication And the like. In addition, communication using 3G / LTE (Long Term Evolution) or millimeter wave radio waves may be performed.

  The imaging unit 240 is obtained via, for example, a lens unit including an imaging lens, a diaphragm, a zoom lens, a focus lens, and the like, a driving unit that drives the lens unit to perform a focus operation and a zoom operation, and the lens unit. A solid-state imaging device that generates an imaging signal based on the imaging light. The solid-state imaging device is composed of, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The imaging unit 240 outputs the captured image data, which is a digital signal, to the control unit 220.

  The operation unit 250 has a function of receiving an input signal (user operation signal) from a user. The operation unit 250 includes, for example, a button, a touch sensor, a trackball, and the like. Here, the operation unit 250 is configured integrally with the display unit 210 to function as a touch panel. The operation unit 250 outputs the input user operation signal to the control unit 220.

  The sensor unit 260 has a function of acquiring information related to the user's operation and state. For example, the sensor unit 260 includes a camera that captures an image of a user's face and eyes, or a hand wearing the wristband type terminal 2. In addition, the sensor unit 260 includes, for example, a camera with a depth detection function, a microphone, a GPS, an infrared sensor, a light sensor, a myoelectric sensor, a nerve sensor, a pulse sensor, a body temperature sensor, a gyro sensor, an acceleration sensor, or a touch sensor. May be provided. Among these, a myoelectric sensor, a nerve sensor, a pulse sensor, and a body temperature sensor may be provided in the band part 2a. Since such a sensor unit 260 can perform sensing at a position close to the user's hand, it can accurately detect the movement of the hand. The sensor unit 260 senses the user's operation and state, and outputs information indicating the sensing result to the control unit 220.

  The control unit 220 functions as an arithmetic processing unit and a control unit, and controls the overall operation in the wristband type terminal 2 according to various programs. The control unit 220 is configured by, for example, a CPU (Central Processing Unit) or a microprocessor. The control unit 220 may include a ROM (Read Only Memory) that stores programs to be used, calculation parameters, and the like, and a RAM (Random Access Memory) that temporarily stores parameters that change as appropriate.

  The control unit 220 includes, for example, a recognition unit 221 and a detection unit 222, thereby enabling gesture input. The recognition unit 221 has a function of recognizing the movement of the user's hand on which the band unit 2a is attached. Specifically, the recognition unit 221 recognizes the movement of the hand by image recognition using an image (for example, an image obtained by capturing the user's hand) input from the sensor unit 260, motion recognition, or the like. The control unit 220 performs various processes such as screen transition based on the recognition result by the recognition unit 221. The detection unit 222 has a function of detecting a user operation on the projection image Y <b> 1 by the projection display device 1. For example, the detection unit 222 detects a user operation such as flicking or touching the projection image. The control unit 220 transmits information indicating the user operation detected by the detection unit 222 to the smartphone 3, and the smartphone 3 performs processing according to the user operation. Thereby, in wristband type terminal 2, the same function (screen transition etc.) as operation (flick, touch, etc.) performed with respect to the touch panel of smart phone 3 is performed in display part 210 or a user's hand. Can do. For example, when the user flicks up and down with respect to the projection image Y1, the function of scrolling the projection image Y1 can be executed.

  In the example illustrated in FIG. 13, a map image generated using a GPS (Global Positioning System) function in the smartphone 3 is displayed on the display unit 210 and is projected as a projection image Y1. In the wristband type terminal 2, there is a limit to the physical size of the display unit 210 in order to realize portability, and it may be difficult for the user to view the display image on the display unit 210. In such a case, the visibility of the image can be improved by using the projection display device 1 and enlarging the image to an inch size equivalent to that of the smartphone 3, for example, and projecting the image onto the hand. Moreover, since the image received from the smart phone 3 can be seen at hand in the state which put the smart phone 3 in a pocket, a bag, etc., it leads to the improvement of usability.

  In the display system as described above, when the color balance of the illumination light of the light source device 10 is adjusted, or when infrared rays are used in the sensor unit 260, the light source device (for example, the light source device 10) according to the above embodiment is used. It can be used suitably.

<Application example 3>
FIG. 15 schematically illustrates the configuration of a display system according to Application Example 3. This display system includes a projection display device 1 including a light source device (for example, the light source device 10) according to the above-described embodiment, a laser pointer 4, and a PC 5 that outputs projection content to the projection display device 1. It is provided. The projection content is a chart, a sentence, various other graphic images, a map, a website, or the like.

  The laser pointer 4 has a function of irradiating laser light (invisible light or visible light) in response to a pressing operation of the operation button 20a by the user. The user can use the laser pointer 4 to irradiate an image projected on the screen 110 with laser light, and for example, can give a presentation while indicating the irradiation position P in accordance with the explanation location.

  The PC 5 generates image data for projection, transmits the image data to the projection display device 1 by wire or wireless, and performs projection control. In FIG. 15, a notebook PC is shown as an example, but the PC 5 is not limited to a notebook PC, and may be a desktop PC or a server on a network (cloud).

  In this application example, the projection display device 1 has an imaging unit for projecting an image received from the PC 5 onto the screen 110 and recognizing irradiation by the laser pointer 4 on the projection image. In the imaging unit, detection using laser light (invisible light or visible light) irradiated on the screen 110 is possible. The imaging unit may be built in the projection display device 1 or may be externally attached. By using the light source device (for example, the light source device 10) of the above-described embodiment or the like in the projection display device 1, it is possible to output a plurality of wavelengths of combined light using one type of light source as described above. Thereby, it is not necessary to separately provide a light source for projection and a light source for imaging, and simplification and compactness of the entire apparatus can be realized.

  As described above, the embodiments and modifications have been described, but the present disclosure is not limited to the above-described embodiments and the like, and various modifications can be made. For example, the arrangement and number of components of the optical system exemplified in the above-described embodiments (for example, the light source unit, the optical path splitting element, the lens, the optical path synthesis element, the optical path conversion element, etc.) are merely examples, It is not necessary to provide a component, and other components may be further provided.

  In the above-described embodiment and the like, an example in which one or two types of phosphors that convert the first wavelength range emitted from the light source (excitation light source) are used has been described, but there are three or more types of phosphors. It may be. Moreover, according to a use, not only one light source but two or more light sources may be arrange | positioned. It is only necessary to include a configuration that can divide the light emitted from one light source into two or more kinds of phosphors and synthesize the light paths of the respective wavelengths after wavelength conversion (color synthesis).

  Furthermore, the projection display device and the display system described as application examples of the light source device of the above-described embodiment and the like are examples, and are not limited to those described above. For example, the light source device of the present disclosure can also be applied to a night vision device (night vision system) using infrared rays. In addition, the effect described in this specification is an illustration to the last, and is not limited to the description, There may exist another effect.

Moreover, this indication can take the following structures.
(1)
A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor.
(2)
The light source device according to (1), wherein the optical path splitting element also serves as the optical path combining element.
(3)
The optical path splitting element transmits a part of the light in the first wavelength band emitted from the light source along the first optical path, and transmits the other light along the second optical path. The light source device according to (1) or (2), configured to reflect.
(4)
The light path device according to (2), wherein the optical path splitting element is configured to transmit one light of the second and third wavelength regions and reflect the other light.
(5)
A first wavelength converter having the first phosphor, a rotating body that holds the first phosphor, and a drive unit that drives the rotating body;
(1) to (4), comprising: the second phosphor, a rotating body that holds the second phosphor, and a second wavelength conversion unit that includes a drive unit that drives the rotating body. The light source device according to any one of the above.
(6)
A third wavelength conversion unit including: the first phosphor; the second phosphor; a rotator that holds the first and second phosphors; and a drive unit that drives the rotator. The light source device according to any one of (1) to (4).
(7)
The light source device according to any one of (1) to (6), wherein the optical path splitting element is a dichroic mirror or a dichroic prism.
(8)
The light source device according to (5), wherein the first and second wavelength conversion units are of a reflective type.
(9)
The light source includes a light source that emits linearly polarized light as light in the first wavelength range,
The optical path splitting element transmits a first polarization component of the light in the first wavelength band along the first optical path and reflects a second polarization component along the second optical path. The light source device according to (1) or (2), wherein the light source device is configured to cause
(10)
The light source device according to (9), further including a polarization rotation element between the light source and the optical path splitting element.
(11)
The light path device according to (9) or (10), wherein the optical path splitting element is configured to transmit one light of the second and third wavelength regions and reflect the other light. .
(12)
The light source device according to any one of (9) to (11), wherein the optical path splitting element is a polarization beam splitter.
(13)
The first wavelength region is a blue region;
The second wavelength range includes a green range and a red range,
The light source device according to any one of (1) to (12), wherein the third wavelength range is an infrared range.
(14)
The first wavelength region is an ultraviolet region;
The second wavelength range includes a green range and a red range,
The light source device according to any one of (1) to (12), wherein the third wavelength range is an infrared range.
(15)
The first wavelength region is a blue region;
The second wavelength region is a green region;
The light source device according to any one of (1) to (12), wherein the third wavelength range is a red range.
(16)
The first wavelength region is an ultraviolet region;
The second wavelength region includes a green region;
The light source device according to any one of (1) to (12), wherein the third wavelength range is a red range.
(17)
The first wavelength region is an ultraviolet region;
The second wavelength range includes a green range and a red range,
The light source device according to any one of (1) to (12), wherein the third wavelength range is a blue range.
(18)
The first wavelength region is a blue region;
The second wavelength range includes a green range and a red range,
The light source device according to any one of (1) to (12), wherein the third wavelength range is a red range.
(19)
A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor. A projection display device having the same.
(20)
Equipped with a projection display,
The projection display device
A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor. Having a display system.

  This application claims priority on the basis of Japanese Patent Application No. 2015-085782 filed on April 20, 2015 at the Japan Patent Office. The entire contents of this application are incorporated herein by reference. This is incorporated into the application.

  Those skilled in the art will envision various modifications, combinations, subcombinations, and changes, depending on design requirements and other factors, which are within the scope of the appended claims and their equivalents. It is understood that

Claims (20)

A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor. The light source device according to claim 1, wherein the optical path splitting element also serves as the optical path combining element. The optical path splitting element transmits a part of the light in the first wavelength band emitted from the light source along the first optical path, and transmits the other light along the second optical path. The light source device according to claim 2, wherein the light source device is configured to reflect light. The light source device according to claim 2, wherein the optical path splitting element is configured to transmit one light of the second and third wavelength regions and reflect the other light. A first wavelength converter having the first phosphor, a rotating body that holds the first phosphor, and a drive unit that drives the rotating body;
The light source device according to claim 1, further comprising: a second wavelength conversion unit including the second phosphor, a rotating body that holds the second phosphor, and a driving unit that drives the rotating body. . A third wavelength conversion unit including: the first phosphor; the second phosphor; a rotator that holds the first and second phosphors; and a drive unit that drives the rotator. The light source device according to claim 1 provided. The light source device according to claim 1, wherein the optical path dividing element is a dichroic mirror or a dichroic prism. The light source device according to claim 5, wherein the first and second wavelength conversion units are of a reflective type. The light source includes a light source that emits linearly polarized light as light in the first wavelength range,
The optical path splitting element transmits a first polarization component of the light in the first wavelength band along the first optical path and reflects a second polarization component along the second optical path. The light source device according to claim 1, wherein the light source device is configured to cause The light source device according to claim 9, further comprising a polarization rotation element between the light source and the optical path splitting element. The light source device according to claim 9, wherein the optical path splitting element is configured to transmit one light of the second and third wavelength regions and reflect the other light. The light source device according to claim 9, wherein the optical path splitting element is a polarization beam splitter. The first wavelength region is a blue region;
The second wavelength range includes a green range and a red range,
The light source device according to claim 1, wherein the third wavelength region is an infrared region. The first wavelength region is an ultraviolet region;
The second wavelength range includes a green range and a red range,
The light source device according to claim 1, wherein the third wavelength region is an infrared region. The first wavelength region is a blue region;
The second wavelength region is a green region;
The light source device according to claim 1, wherein the third wavelength range is a red range. The first wavelength region is an ultraviolet region;
The second wavelength region includes a green region;
The light source device according to claim 1, wherein the third wavelength range is a red range. The first wavelength region is an ultraviolet region;
The second wavelength range includes a green range and a red range,
The light source device according to claim 1, wherein the third wavelength region is a blue region. The first wavelength region is a blue region;
The second wavelength range includes a green range and a red range,
The light source device according to claim 1, wherein the third wavelength range is a red range. A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor. A projection display device having the same. Equipped with a projection display,
The projection display device
A light source that emits light in a first wavelength range;
An optical path splitting element that splits an optical path of light in the first wavelength range emitted from the light source into first and second optical paths;
A first phosphor disposed on the first optical path and excited by light in the first wavelength band and emitting light in a second wavelength band different from the first wavelength band;
Second fluorescence arranged on the second optical path and excited by light in the first wavelength range and emitting light in a third wavelength range different from the first and second wavelength ranges Body,
A light source device comprising: an optical path synthesizing element that synthesizes light in the second wavelength range emitted from the first phosphor and light in the third wavelength range emitted from the second phosphor. Having a display system.

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